Prevent your Network Card to wake your Windows Vista/7 up from its sleep
Check your network card properties through the device manager and disable the “Allow this devide to wake the computer” feature.
1) Right click on your “My Computer” then select Properties.
2) Click Device Manager on the left side of the Properties window.
3) Check your Network card on the Network Adapters (Click on the + sign to expand).
4) Right click on your network card and select properties.
5) Go to the Power Management tab and untick the option there to prevent your network card from ever waking up your Windows.
Find out what wakes up your Windows 7/Vista from its sleep
To find out what event/device woke up your Windows from its sleep state, go to command prompt (type cmd on the Run/Search box and press ENTER), then type this:
powercfg – lastwake
To get the most detailed info (and probably easiest) on the device that wakes your Windows up during the sleep, type:powercfg –devicequery wake_armed
There! You’ll find the culprit I clicked my mouse to wake my Windows up intentionally so that’s why you see an HID compliant mouse on the screenshot above. Yours might be different.
Hope this helps!
If it still doesn’t work:
Check out your Power Management Options on your Control Panel (Start, Control Panel, Power Settings, Change plan settings, Change advanced power settings).-> “Multimedia settings” option, “When sharing media.” ->”Allow the computer to sleep.